Millionaire calculator Enter the details of your savings and press calculate to see how long it will take you to become a millionaire. Initial Savings Amount (£): The initial amount held in savings. Monthly Savings Amount (£): The amount to be saved each month. Average Annual Return on Investment (%): The expected average return on investment. Average Annual Inflation (%): The expected level that inflation shall rise by annually. Amount Desired (£): The total amount desired. Calculate Investment: Could you live on the amount you have desired? Find out by ticking the box and completing the additional information below, if it applies to you. Rate of Return (%): The rate of return you expect to make from your investment. Calculate Note: These calculations are only for illustrative purposes and are not a substitute for professional advice.